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NAS message

0

Hi

Iam developing custom dissector where in one of the part i need to dissect NAS message (3G based) 3gpp spec.

Does wireshark support nas dissection? If yes how do i call the dissector and what parameters to pass.

Thanks

Raj

asked 21 Oct '14, 12:03

umar's gravatar image

umar
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accept rate: 0%

One Answer:

2

Yes it is supported. You just need to call the "gsm_a_dtap" dissector with a tvb containing the message payload.

answered 21 Oct '14, 13:17

Pascal%20Quantin's gravatar image

Pascal Quantin
5.5k●10●60
accept rate: 30%

Hi Pascal Quantin,

This Works for me :) Many Thanks!

Need to confirm, Instead of Header Name NAS Message : ------ it display as GSM A-I/F DTAP : --- ---

Iam looking for TS 24.008 version 4.3 Is there any other function i have to use instead of gsm_a_dtap??

Thanks!

Best Regards Raj

(22 Oct '14, 22:52) umar
1

If you look at the header of file packet-gsm_a_dtap.c you can see which specifications are covered, the info may not be up to date with the latest specs covered.

(23 Oct '14, 04:01) Anders ♦
1

It displays GSM A-IF DTAP because historically those dissectors were added for the corresponding network interface. As stated at the beginning of packet-gsm_a_dtap.c file:

Routines for GSM A Interface DTAP dissection - A.K.A. GSM layer 3

NOTE: it actually includes RR messages, which are (generally) not carried over the A interface on DTAP, but are part of the same Layer 3 protocol set

(23 Oct '14, 04:16) Pascal Quantin